TCP SYN (p0f)

6:54+10:0:1300:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:flow:0

first seen 2026-09-15 06:09 · last seen 2026-10-12 14:33 · JSON

Inconsistencies

User-Agents observed with this fingerprint that contradict what it proves at the wire. all inconsistencies →

fingerprint User-Agent claims wire shows confidence seen first seen last seen

6:54+10:0:1300:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:flow:0

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleW…

User-Agent claims Windows

TCP SYN initial TTL 54+10 indicates Unix-like

The initial TTL is set by the sending kernel (64 on Unix-like systems, 128 on Windows) and survives NAT. But VPNs, proxies and tunnels legitimately replace the sending stack, so this check never exceeds medium confidence.

Full User-Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0 Safari/537.36
Observed TTL	54+10 (observed + path distance → initial)
Claimed OS	Windows
Confidence	low — single sighting of an environmental signal

low

2026-09-15

Distinct clients per day (last 30 days, peak 1/day)

Distinct clients are counted by IP-hash per complete UTC day — unlike observation counts this is insensitive to one chatty client, but NAT merges clients and address rotation splits them.

Decomposed attributes

IP version	`6`
Initial TTL	`54+10`
Options length	`0`
MSS	`1300`
Window size	`65535`
Window scale	`6`
Options layout	`mss,nop,ws,nop,nop,ts,sok,eol+1`
Quirks	`flow`
Payload class	`0`

Co-observed signals

Signals from other families seen in the same observation. A fingerprint spread thinly across many lower-layer signatures is a classic inconsistency signal.

TLS ClientHello (JA4)

fingerprint	co-occurrences
`t13d3013h2_1d37bd780c83_8537cf56674e` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.	1
`t13d3113h2_e8f1e7e78f70_1b3407e2c936`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn020000_5594a17e7e7e_000000000000_000000000000` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.	2

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`3:100;4:65536;2:0\|1048510465\|0\|m,s,a,p` Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.	1
`3:100;4:33554432;2:0\|33488897\|0\|m,p,s,a` Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1, curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`65535_2-1-3-1-1-8-4-0-0_1300_6`	2

User-Agent

fingerprint	co-occurrences
`curl/8.14.1`	1
`Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0 Safari/537.36`	1

Country

fingerprint	co-occurrences
`RU` · Russia	2

Network (ASN)

fingerprint	co-occurrences
`AS12389` · PJSC Rostelecom	2